The statement that ALL civilizations, ancient or otherwise, were male-dominated and patriarchal is absolutely false. I have not the time to look up specifics, but I do know that some African tribes and some North American tribes were matriarchal, and I'm pretty sure that more were matrilineal (which is what we're talking about here; I personally still think Guardia was patriarchal but matrilineal, which is rather odd).
Yes, to say that the majority of human civilizations were/have been male-dominated, patriarchal and patrilineal is a true statement, but to say that all of them were is absolutely and unequivocably false. Do your research before you go about making an ass of yourself.
And Sir Frog, your assertion that both Guardia XXXIII and Aliza were descendants of XXI and Leene is possible, and fairly likely, and irrefutable, but it's also not quite provable. The only sure thing is that Aliza (and therefore Marle) was descended from XXI and Leene, or at least certainly from Leene (see the Frog Princess ending, though I'm not seriously about to believe that as anything more than a joke). So please stop getting offended when people don't take your assertions as absolute fact. You make a good argument, but it's not fact.
Ultimately, there is no way for us to be absolutely certain on this matter. I think there are two likely scenarios: Either the Guardia line is patriarchal but matrilineal, or Aliza married back into the Guardia family by marrying a (possibly distant, possibly not-so-distant) cousin.